Propane tank explosion in Westlake. Propane tanks on flame blows up in huge ball of fire at Crocker Park. Westlake police are asking the public to stay away from Crocker Park after a construction propane tank exploded this morning near the American Greetings building. Crocker Park said in a statement early reports indicated the tank caught fire and exploded. The cause of the incident is still under investigation. There were no reported injuries.